A few nights ago I was trying to crack my neck and found a weird bump under the skin. I can only feel it when I bend my head to the side, so it's fairly small. It's also sensitive when I touch it. It honestly feels like a stress knot. I've tried massaging it, heat, cracking it... My boyfriend even put tiger balm on it (muscle relaxing). It is still there, but has shrunk. I'm not sure if I should be concerned or go to the doctor or what...